Is it worth learning Java for android?

Question

Java

Should I learn Java for android, or should I still learn kotlin?

Answer 1

Costs. It will be easier to switch to microservices later.

Answer 2

If you plan to do it professionally, then you need to know two languages. If you write enough kotlin for yourself.
Now almost all projects start as kotlin. And most are rewritten (or supplemented) in Kotlin. Those. there is a probability that there will be java on legacy projects.